Vehicle steering device

Abstract

This vehicle steering device is provided with: a rotating member having a male thread section and a cylindrical surface section; a nut that moves in the X direction with respect to the rotating member in a non-rotating state; an annular member inserted into the cylindrical surface and movable in the X direction; and a housing. The annular member has a flat-plate-shaped vertical wall portion. The male thread portion of the rotating member is provided with a first incomplete thread at an end portion on one side in the axial direction, and is provided with a second incomplete thread at an end portion on the other side in the axial direction. An axial end surface portion and a separation portion are provided on one axial side surface of the first incomplete thread. An axial end surface portion and a separation portion are provided on the other axial side surface of the second incomplete thread.

Description

Technical Field

[0001] This disclosure relates to steering systems for vehicles. Background Technology

[0002] In a steering system for vehicles with a steering-by-wire design, the steering wheel and steering wheels are mechanically disconnected. In this structure, the steering reaction force is not transmitted from the steering mechanism containing the steering wheels to the steering wheel. Therefore, a steering reaction force device and a limiting mechanism are provided on the steering shaft connected to the steering wheel.

[0003] The steering reaction force device applies a reaction force to the steering wheel in the opposite direction to its rotation (steering direction), giving the driver a natural steering feel. The steering reaction force device may include, for example, a motor and a reduction mechanism. The steering reaction force generated by the motor is transmitted to the steering shaft via the reduction mechanism. The reduction mechanism may include, for example, a worm shaft and a worm wheel. The rotation of the motor is transmitted to the worm wheel via the meshing of the teeth of the worm shaft and the worm wheel.

[0004] In Patent Document 1, the limiting mechanism comprises: a rotating member that rotates with the steering wheel and has an external thread on its outer periphery; a nut that has an internal thread on its inner periphery and is linearly movable in the axial direction relative to the rotating member; and a stop portion that prevents the linear movement of the nut. The rotating member has an external thread portion and a cylindrical portion adjacent to the external thread portion in the axial direction. The stop portion has an annular member embedded in the outer periphery of the cylindrical portion and a leaf spring embedded in the outer periphery of the annular member.

[0005] Existing technical documents

[0006] Patent documents

[0007] Patent Document 1: German Patent No. 102020126785 Summary of the Invention

[0008] The problem that the invention aims to solve

[0009] The external thread portion has a complete thread portion and incomplete thread portions adjacent to both sides of the complete thread portion along its axial direction. Since the strength of the incomplete thread portion is less than that of the complete thread portion, in Patent Document 1, a cylindrical portion is provided on the outer side of the axial direction and on the inner circumferential side of the incomplete thread portion, so that the annular component and the leaf spring do not contact the incomplete thread portion. Therefore, the limiting mechanism portion of Patent Document 1 is larger in the axial direction, which makes it possible to increase the size of the steering device for vehicles.

[0010] This disclosure was made in view of the above-mentioned issues, and its purpose is to provide a more compact steering device for vehicles.

[0011] Methods for solving problems

[0012] To achieve the above objectives, one approach involves a vehicle steering device in which the steering wheel and steering wheels are mechanically disconnected. This vehicle steering device includes a limiting mechanism that restricts the range of the steering wheel's rotation angle during rotation. The limiting mechanism comprises: a rotating member having an external thread portion and a pair of cylindrical surfaces. The external thread portion has an external thread including complete and incomplete threads on its outer periphery. The pair of cylindrical surfaces are adjacent to the external thread portion on one and the other sides of the central axis and have a diameter smaller than the outer diameter of the external thread portion. The rotating member rotates circumferentially about the central axis in response to the rotation of the steering wheel; a nut having an internal thread on its inner periphery that engages with the external thread, and moves axially relative to the rotating member as it rotates; and a pair of annular members, each inserted into the pair of cylindrical surfaces of the rotating member. It is capable of abutting the nut in the axial direction; and a housing disposed on the outer periphery of the rotating component, the nut, and the pair of annular components, and supporting each annular component of the pair of annular components between the housing and the rotating component. The external thread portion of the rotating component is provided with a first incomplete thread at one end in the axial direction and a second incomplete thread at the other end in the axial direction. The complete thread is disposed between the first incomplete thread and the second incomplete thread. An axial end portion extending along a first plane orthogonal to the central axis and a separation portion separating from the first plane in the axial direction are provided on one side of the first incomplete thread. An axial end portion extending along a second plane orthogonal to the central axis and a separation portion separating from the second plane in the axial direction are provided on the other side of the second incomplete thread.

[0013] As described above, in the limiting mechanism of Patent Document 1, the strength of the incomplete thread is less than that of the complete thread. Therefore, to prevent the annular member and the leaf spring from contacting the incomplete thread, a cylindrical part is provided at a position axially outer and on the inner circumferential side, beyond the axial end of the incomplete thread. Then, the annular member is inserted into the cylindrical part, and the leaf spring is inserted into the outer circumferential side of the annular member. Therefore, the limiting mechanism of Patent Document 1 is axially larger, making it possible to increase the size of the steering device for vehicles.

[0014] In contrast, in the limiting mechanism of this disclosure, the axial end face of one side of the first incomplete thread abuts against the nut-side end face of the longitudinal wall of the annular member, and the axial end face of the other side of the second incomplete thread abuts against the nut-side end face of the longitudinal wall of the annular member.

[0015] Therefore, in this disclosure, firstly, when the nut is moved axially to one side by the rotation of the rotating component and the axial end face of the nut abuts against the longitudinal wall of the annular component, the rotating component is pushed out to the other side, creating an axial gap between the rotating component and the annular component on the axial side. The rotating component pushed out to the other side compresses the annular component on the other side, and its reaction force pushes the axial end face of the second incomplete thread tooth back to one side, but the separating part does not abut against the longitudinal wall.

[0016] That is, when the limiting mechanism is viewed from the side (radially orthogonal to the central axis), the portion of the annular member that contacts the axial end face bulges towards the nut, while the thickness of the portion opposite the separating part remains unchanged. Therefore, when viewed from the side, the annular member is compressed but does not rotate. Consequently, compared to the case where the annular member does not rotate (oscillate), the reaction force exerted from the annular member on the first and second incomplete thread teeth becomes smaller, thus reducing the likelihood of damage to the first and second incomplete thread teeth.

[0017] As described above, in the limiting mechanism of the present invention, the rotating member is pushed out in the opposite direction to the movement direction of the nut, compressing the annular member. The annular member pushes back the incomplete thread teeth through its reaction force, thus further reducing the force exerted by the annular member on the first and second incomplete thread teeth. Therefore, the annular member can abut against the first and second incomplete thread teeth. In addition, since the first and second incomplete thread teeth abut against the annular member, the axial size can be set smaller compared to Patent Document 1, thereby providing a more compact vehicle steering device.

[0018] As a preferred embodiment, when the rotating component is viewed from the axial direction, the axial end face of the first incomplete thread and the axial end face of the second incomplete thread are configured on the same side relative to the central axis.

[0019] As described above, when the nut is moved axially to one side by the rotation of the rotating component and the axial end face of one side of the nut abuts against the longitudinal wall of the annular component on one side, the rotating component is pushed to the other side and compresses the annular component on the other side. Through its reaction force, the rotating component swings in a clockwise direction when viewed from the radial direction.

[0020] In addition, when the nut is moved to the other side of the axis by the rotation of the rotating component and the axial end face of the nut on the other side abuts against the longitudinal wall of the annular component on the other side, the longitudinal wall is compressed, and through its reaction force, the rotating component swings counterclockwise when viewed from the radial direction.

[0021] As described above, when the nut moves to one side of the axial direction and to the other side, the oscillation direction of the rotating component when viewed radially is opposite to each other, thus suppressing the continuous application of local loads to specific parts of the annular component.

[0022] As a preferred embodiment, when the rotating component is viewed from the axial direction, the axial end faces of the first incomplete thread and the second incomplete thread are arranged on opposite sides relative to the central axis.

[0023] As described above, when the nut is moved axially to one side by the rotation of the rotating component and the axial end face of one side of the nut abuts against the longitudinal wall of the annular component on one side, the rotating component is pushed to the other side and compresses the annular component on the other side. Through its reaction force, the rotating component swings in a clockwise direction when viewed from the radial direction.

[0024] In addition, when the nut is moved to the other side of the axis by the rotation of the rotating component, and the axial end face of the nut on the other side abuts against the longitudinal wall of the annular component on the other side, the longitudinal wall is compressed.

[0025] Here, when viewing the rotating component from the axial direction, the axial end faces of the first incomplete thread and the second incomplete thread are positioned on opposite sides relative to the central axis. Therefore, this is the opposite of the case where the axial end faces of the first and second incomplete threads are positioned on the same side relative to the central axis. Due to the reaction force of the longitudinal wall portion relative to compression, the rotating component swings clockwise when viewed from the radial direction.

[0026] As described above, when the nut moves axially to one side and to the other side, the direction of oscillation of the rotating component when viewed radially is the same. In this case, it is possible to apply a localized load to a specific part of the annular component, but if the rotating component is rotated, for example, 180 degrees around the central axis after a specified period, it is possible to suppress the continuous application of a localized load to a specific part of the annular component.

[0027] Preferably, at least one of the pair of annular components has a main body and a cover layer disposed on the surface portion of the main body, wherein the elastic modulus of the cover layer is smaller than that of the main body. This reduces contact noise (interference noise) when the nut contacts the annular component. Furthermore, the cover layer can be made of a material that reduces the coefficient of friction with the target material to prevent snagging when the nut contacts the component. Alternatively, grease lubrication can be used instead of the cover layer.

[0028] As a preferred embodiment, at least one of the pair of annular members has a protrusion that projects axially toward the nut side and is capable of abutting against the nut.

[0029] Therefore, compared to a ring-shaped component without protrusions, the distance that the nut can move axially is reduced. Consequently, the limit range of the steering wheel's steering angle can be reduced, and the angle at which the steering wheel can rotate can be set smaller.

[0030] As a preferred embodiment, the housing has a cylindrical housing body extending circumferentially, and a sealing portion that seals one side of the housing body in the axial direction.

[0031] As described above, since the housing is sealed by the sealing part, it is possible to prevent foreign objects such as dust from entering the inside of the housing. In addition, it is possible to suppress the leakage of oil from the inside of the housing to the outside.

[0032] As a preferred embodiment, the housing has: a cylindrical housing body portion extending circumferentially and open on one side in the axial direction; a protrusion portion disposed at the end of the housing body portion on one side in the axial direction and protruding towards the inner circumferential side and having a recessed portion recessed towards the outer circumferential side; and a sealing member housed in the recessed portion, wherein the annular member is disposed on the inner circumferential side of the recessed portion of the protrusion portion, and the front end of the inner circumferential side of the sealing member can abut against the outer circumferential surface of the annular member.

[0033] Because an opening is provided in the main body of the housing, foreign objects such as dust may enter the housing from the opening towards the inside. However, since the front end of the sealing member abuts against the annular member, the entry of foreign objects can be prevented. In addition, the sealing member can prevent oil from leaking from the inside of the housing to the outside.

[0034] Invention Effects

[0035] According to this disclosure, it is possible to provide a smaller steering device for vehicles. Attached Figure Description

[0036] Figure 1 This is a schematic diagram showing the overall structure of the vehicle steering device according to the first embodiment.

[0037] Figure 2 It means Figure 1 A partial sectional view.

[0038] Figure 3 It means Figure 2 A partial sectional view.

[0039] Figure 4 This is a cross-sectional view of the limiting mechanism section of the first embodiment.

[0040] Figure 5It is Figure 4 A magnified sectional view of a portion of the document.

[0041] Figure 6 This is an exploded perspective view of the limiting mechanism section of the first embodiment.

[0042] Figure 7 yes Figure 6 A three-dimensional view of the rotating component.

[0043] Figure 8 yes Figure 6 Side view of the rotating component.

[0044] Figure 9 Observing from direction A Figure 8 A schematic diagram of the rotating component.

[0045] Figure 10 Observing from direction B Figure 8 A schematic diagram of the rotating component.

[0046] Figure 11 This is a side view of the rotating component in the modified example.

[0047] Figure 12 Observing from direction A Figure 11 A schematic diagram of the rotating component.

[0048] Figure 13 Observing from direction B Figure 11 A schematic diagram of the rotating component.

[0049] Figure 14 This is a cross-sectional view of the limiting mechanism section in the second embodiment.

[0050] Figure 15 yes Figure 14 An enlarged cross-sectional view of the first annular component.

[0051] Figure 16 This is a cross-sectional view of the limiting mechanism section in the third embodiment.

[0052] Figure 17 This is a cross-sectional view of the limiting mechanism section in the fourth embodiment.

[0053] Figure 18 This is a cross-sectional view of the limiting mechanism section in the fifth embodiment. Detailed Implementation

[0054] Referring to the accompanying drawings, the embodiments (implementations) for carrying out the present invention will be described in detail. The present invention is not limited to the contents described in the following embodiments. Furthermore, the constituent elements described below include elements readily conceived by those skilled in the art, and substantially the same elements. Moreover, the constituent elements described below can be appropriately combined. Also, parts with the same structure are labeled with the same symbols and their descriptions are omitted. Additionally, in the coordinate system, the X direction represents the axial direction of the rotating component, the X1 side is one side of the axial direction, and the X2 side is the other side of the axial direction.

[0055] [First Implementation Method]

[0056] The first embodiment will be described. Figure 1 This is a schematic diagram showing the overall structure of the vehicle steering device according to the first embodiment. Figure 2 It means Figure 1 A partial sectional view. Figure 3 It means Figure 2 A partial sectional view.

[0057] like Figure 1 As shown, the vehicle steering system 100 includes a steering unit 4, a control unit (ECU) 14, and a steering unit 20.

[0058] like Figures 1-3 As shown, a steering reaction force device 13 is provided in the steering unit 4. When the steering wheel 10 is rotated for steering, the steering reaction force device 13 applies a steering reaction force to the steering wheel 10 in the opposite direction to the rotation direction of the steering wheel 10. The control unit (ECU) 14 calculates the reaction torque corresponding to the vehicle's driving state based on the action information, and adjusts the power value supplied to the motor 110 of the steering reaction force device 13 based on the reaction torque. The motor 110 operates according to the power value, thereby transmitting the steering reaction force of the steering wheel 10 to the operator. Furthermore, in the steering system 100 for vehicles with a steering-by-wire system, the steering wheel 10 and the steering wheel 22 are not mechanically connected. However, in this invention, "not connected" also includes, for example, a method in which the steering wheel 10 and the steering wheel 22 can be connected via a clutch device or the like in an emergency.

[0059] Furthermore, the control unit (ECU) 14 calculates the current command value based on the operation information and controls the current supplied to the steering motor 21 of the steering unit 20. In the steering unit 20, the steering wheel 22 is turned via various gears connected to the steering motor 21. Hereinafter, the various structures in the vehicle steering system 100 will be described in detail.

[0060] like Figure 1 As shown, the steering unit 4 includes a steering wheel 10, a steering shaft 11, a steering housing 12, and a steering reaction force device 13.

[0061] like Figure 2 as well as Figure 3 As shown, the steering shaft 11 extends along the X direction (axial direction). A steering wheel 10 is rotatably connected to the steering shaft 11. The steering shaft 11 is housed inside the steering housing 12. The steering shaft 11 has a column shaft 15, an output shaft 16, and a torsion bar 17.

[0062] The column shaft 15 and the output shaft 16 are connected via a torsion bar 17. Specifically, an insertion hole is provided axially at the X1 side end of the column shaft 15, and the torsion bar 17 is inserted into this insertion hole. The column shaft 15 and the torsion bar 17 are connected via a pin 122 in a manner that prevents them from rotating relative to each other. A through hole is provided axially through the output shaft 16, and the X1 side end of the torsion bar 17 is inserted into this through hole. Thus, the output shaft 16 and the torsion bar 17 are connected in a manner that prevents them from rotating relative to each other. Therefore, when the steering wheel 10 is rotated, the steering shaft 11 also rotates.

[0063] In addition, the steering housing 12 includes a shaft retaining member 121, a rotating support member 123, 124 and a sub-housing 127.

[0064] Rotary support member 123 is located on the X1 side of shaft retaining member 121, and rotary support member 124 is located on the X1 side of rotary support member 123. Sub-housing 127 is located on the X1 side of rotary support member 124. Bearing 125 is provided on the radially inner side of rotary support member 124, and bearing 126 is provided on the radially inner side of sub-housing 127. Output shaft 16 is supported by bearings 125 and 126 to enable rotation. In addition, torque sensor 128 is provided between rotary support member 123 and rotary support member 124. Torque sensor 128 detects the rotational torque transmitted between column shaft 15 and output shaft 16.

[0065] Here, the steering reaction force device 13 includes a steering shaft 11, a worm gear 18, a worm shaft 19, and a motor 110.

[0066] A worm gear 18 is mounted on the outer periphery of the output shaft 16 of the steering shaft 11. The worm gear 18 has a spindle portion 18a and a gear tooth portion 18b. The gear tooth portion 18b is provided on the outer periphery of the spindle portion 18a. The worm shaft 19 and the motor 110 are located on the Y2 side of the worm gear 18 (see reference). Figure 6 A worm shaft 19 is mounted on the output shaft of the motor 110. The worm shaft 19 has a toothed portion 19a. The toothed portion 19a meshes with a gear toothed portion 18b.

[0067] Motor 110 becomes the source of steering reaction force. That is, the output of motor 110 becomes reaction torque, which is transmitted from steering shaft 11 to steering wheel 10 via worm gear 18 and worm shaft 19.

[0068] like Figure 2 as well as Figure 3 As shown, the rotating component 31 has a central axis AX, the axial direction of which is aligned with the X direction. The rotating component 31, included in the limiting mechanism 3, is splinedly fitted at the X1 side end of the output shaft 16 of the steering shaft 11. Specifically, an inner spline 319 extending in the X direction is provided on the inner circumference of the rotating component 31, and an outer spline extending in the X direction is provided on the outer circumference of the X1 side end of the output shaft 16. The outer spline of the output shaft 16 is fitted into the inner spline 319 of the rotating component 31. Therefore, the rotating component 31 can move relative to the output shaft 16 in the X direction but cannot rotate circumferentially about the central axis AX. In other words, the rotating component 31 rotates integrally with the output shaft 16.

[0069] like Figure 2 as well as Figure 3 As shown, a limit mechanism 3 is provided on the X1 side of the output shaft 16 relative to the steering shaft 11. The limit mechanism 3 will be described in detail below. Figure 4 This is a cross-sectional view of the limiting mechanism section of the first embodiment. Figure 5 It is Figure 4 A magnified sectional view of a portion of the document. Figure 6 This is an exploded perspective view of the limiting mechanism section of the first embodiment.

[0070] like Figure 4 As shown, the limiting mechanism 3 includes a rotating component 31, a nut 32, a first annular component 331, a second annular component 331A, and a housing 35.

[0071] like Figure 4 as well as Figure 5 As shown, the rotating component 31 has a central axis AX. The axial direction of the central axis AX is the X direction. The direction around the central axis AX is circumferential. The direction orthogonal to the central axis AX is radial. The rotating component 31 includes an external threaded portion 311, a first cylindrical portion 312, and a second cylindrical portion 312A.

[0072] The external thread portion 311 has an external thread 310 on its outer periphery. The external thread 310 has a bottom 310a. The external thread 310 includes a complete thread tooth 314, a first incomplete thread tooth 315, and a second incomplete thread tooth 316. The first incomplete thread tooth 315 is located at the end closest to the X1 side, and the second incomplete thread tooth 316 is located at the end closest to the X2 side.

[0073] The first cylindrical portion 312 is adjacent to the external thread portion 311 on the X1 side. The first cylindrical portion 312 has a cylindrical surface 313. The cylindrical surface 313 extends circumferentially about the central axis AX. The diameter of the cylindrical surface 313 is smaller than the outer diameter of the external thread portion 311. Additionally, the second cylindrical portion 312A is adjacent to the external thread portion 311 on the X2 side. The second cylindrical portion 312A also has a cylindrical surface 313. The rotating member 31 has an axial end face 317 at its X1 side end and an axial end face 318 at its X2 side end. The rotating member 31 will be described in further detail later.

[0074] Nut 32 is disposed on the outer peripheral side of rotating component 31. Nut 32 has an internal thread 321 on its inner peripheral side. The internal thread 321 engages with the external thread 310 of rotating component 31. The outer peripheral surface 324 of nut 32 is a cylindrical surface extending circumferentially. The end of nut 32 on the X1 side has an axial end face 322, and the end of nut 32 on the X2 side has an axial end face 323. The axial end face 322 of nut 32 can abut against the longitudinal wall portion 332 of the first annular component 331. The axial end face 323 of nut 32 can abut against the longitudinal wall portion 332A of the second annular component 331A.

[0075] The first annular member 331 has an annular shape extending circumferentially. The first annular member 331 is inserted into the first cylindrical portion 312. The inner diameter of the first annular member 331 is larger than the outer diameter of the first cylindrical portion 312. Therefore, the first annular member 331 can move in the X direction while inserted into the first cylindrical portion 312. The first annular member 331 has a longitudinal wall portion 332 and a cylindrical portion 333. The longitudinal wall portion 332 extends radially outward. The cylindrical portion 333 extends circumferentially. The longitudinal wall portion 332 and the cylindrical portion 333 are connected via a corner portion 334.

[0076] A second annular member 331A is inserted into the second cylindrical surface 312A. The second annular member 331A has a longitudinal wall portion 332A and a cylindrical portion 333A. The longitudinal wall portion 332A extends radially outward. The longitudinal wall portion 332A is disposed opposite to the nut 32 on the X2 side. The cylindrical portion 333A extends circumferentially. The longitudinal wall portion 332A and the cylindrical portion 333A are connected via a corner portion 334A.

[0077] The housing 35 is disposed on the outer periphery of the rotating component 31, the nut 32, the first annular component 331, and the second annular component 331A. The housing 35 includes a first housing 351 and a second housing 352.

[0078] The first housing 351 is disposed on the X2 side of the housing 35. The first housing 351 has a joint portion 351a, a longitudinal wall portion 351b, a cylindrical portion 351c, and a flange 351d.

[0079] The connecting portion 351a engages with the connecting portion 352a of the second housing 352. The longitudinal wall portion 351b extends radially, and the cylindrical portion 351c extends circumferentially. A second bolt hole H2 is provided in the flange 351d. An internal thread is provided on the inner circumference of the second bolt hole H2, which engages with the external thread of the bolt BL.

[0080] The second housing 352 has a joint portion 352a, a cylindrical portion 352b, a radial wall portion 352c, and a flange 352h.

[0081] The cylindrical portion 352b extends circumferentially. The radial wall portion 352c extends radially. A through hole 353 is provided at the radial center of the radial wall portion 352c, into which the first annular member 331 and the rotating member 31 are inserted. A first bolt hole H1 is provided in the flange 352h. A through hole is provided on the inner circumference of the first bolt hole H1, through which the axial portion of the bolt BL passes. Therefore, the flanges 351d and 352h are fastened together by the bolt BL.

[0082] In addition, such as Figure 5 As shown, the outer diameters of both the first annular component 331 and the second annular component 331A are the first outer diameter D1. Specifically, the first radial distance between the outer peripheral end of the longitudinal wall portion 332 of the first annular component 331 and the central axis AX is the same as the second radial distance between the outer peripheral end of the longitudinal wall portion 332A of the second annular component 331A and the central axis AX. The first outer diameter D1 is twice the first distance or twice the second distance. Furthermore, the outer diameter of the cylindrical surface 313 is the second outer diameter D2. The second outer diameter D2 is the same as the diameter of the bottom 310a of the external thread 310. The first outer diameter D1 is larger than the second outer diameter D2.

[0083] Next, refer to Figure 6 The assembly sequence of the limiting mechanism 3 will be briefly explained. For example... Figure 6As shown, firstly, the rotating component 31 is fastened to the inner circumference of the nut 32, the first annular component 331 is inserted into the first cylindrical surface 312 of the rotating component 31, and the second annular component 331A is inserted into the second cylindrical surface 312A. Next, in this state, the rotating component 31, nut 32, first annular component 331, and second annular component 331A are inserted into the inner side of the second housing 352. At this time, the protrusion 325 is fitted into the groove 352j. Then, the first housing 351 is bolted to the second housing 352. Specifically, the flange 351d is mated with the flange 352h, and the second bolt hole H2 communicates with the first bolt hole H1. Then, the bolt BL is passed through the first bolt hole H1 and engages with the internal thread of the second bolt hole H2, thereby completing the assembly of the limiting mechanism 3. Furthermore, as described above, since the protrusion 325 of the nut 32 engages with the groove 352j of the second housing 352, the nut 32 moves linearly in the X direction without rotating relative to the second housing 352.

[0084] Next, the structure of the rotating component 31 will be described. Figure 7 yes Figure 6 A three-dimensional view of the rotating component. Figure 8 yes Figure 6 Side view of the rotating component. Figure 9 Observing from direction A Figure 8 A schematic diagram of the rotating component. Figure 10 Observing from direction B Figure 8 A schematic diagram of the rotating component.

[0085] First, when viewed from the X direction, the rotating component 31 of the embodiment, as in the embodiment, Figure 9 , Figure 10 As shown, axial end faces 315a and axial end faces 316a are positioned on the Z1 side, which is the same side, relative to a straight line L orthogonal to the central axis AX. The straight line L extends along the Y direction. Figure 8 As shown, the rotating component 31 has a first incomplete thread 315 at the end closest to the X1 side of the external thread portion 311. The axial end portion 315a on the X1 side of the first incomplete thread 315 is... Figure 9 The shaded area is shown. The axial end face 315a extends radially along a first plane orthogonal to the central axis AX. Figure 9In this configuration, the axial end portion 315a is located on the Z1 side of the external thread portion 311 in the circumferential direction. Specifically, the axial end portion 315a extends from the Y1 side, through the Z1 side, and covers half the circumference to the Y2 side. Furthermore, the Y direction is a radial direction orthogonal (intersecting) with the X direction (axial direction), and the Z direction is a radial direction orthogonal (intersecting) with both the X and Y directions. The Y1 side is one side of the Y direction, and the Y2 side is the other side of the Y direction. The Z1 side is one side of the Z direction, and the Z2 side is the other side of the Z direction. The radial width is smallest on the Y1 side, gradually increasing towards the Z1 side, reaching its maximum on the Z1 side. Conversely, the width gradually decreases towards the Y2 side, reaching its minimum at Y2. Additionally, the radial width on the Z1 side is... Figure 9 The width of the complete thread tooth 314 shown is the same. In contrast, Figure 9 The separation portion 315b shown outside the shaded line is... Figure 9 It is located on the opposite side, separated by the central axis AX. That is, it extends circumferentially from the Y1 side through the Z2 side to the Y2 side, covering half a circumference. In addition, the "incomplete thread" in this invention refers to "a mountain-shaped incomplete thread portion made by the chamfer or bite portion of a thread processing tool" (see JIS B 0101).

[0086] Here, assuming a first plane orthogonal to the central axis AX, the shaded axial end portion 315a abuts against this first plane. The separation portion 315b separates relative to this first plane towards the X2 side (the central side of the axial direction of the rotating member 31). When viewed from the X direction, the axial end portion 315a is located on the opposite side of the separation portion 315b relative to the straight line L orthogonal to the central axis AX.

[0087] like Figure 10 As shown, a second incomplete thread 316 is provided at the end closest to the X2 side of the external thread portion 311. The axial end portion 316a on the X2 side of the second incomplete thread 316 is... Figure 10 The shaded area is shown. The axial end face 316a extends radially along a second plane orthogonal to the central axis AX. Figure 10 In this configuration, the axial end portion 316a is located on the Z1 side in the circumferential direction of the external thread portion 311. Specifically, the axial end portion 316a extends from the Y2 side through the Z1 side and covers half a circumference to the Y1 side. The radial width is smallest on the Y2 side, gradually increases as it approaches the Z1 side from the Y2 side, and is largest on the Z1 side. Conversely, the width gradually decreases as it approaches the Y1 side, becoming smallest at Y1. Figure 10 The separation section 316b shown is in Figure 10 The straight line L, which is orthogonal to the central axis AX, is located on the opposite side of the axial end portion 316a. That is, the separation portion 316b extends circumferentially from the Y2 side through the Z2 side to the Y1 side, covering half a circumference.

[0088] Here, when assuming a second plane orthogonal to the central axis AX, the axial end face 316a, which is shaded, abuts against the second plane. Figure 10 The separation portion 316b shown is separated from the second plane toward the X2 side (the central side of the axial direction of the rotating member 31). Viewed from the X direction, the axial end portion 316a is located on the opposite side of the separation portion 316b relative to the straight line L orthogonal to the central axis AX.

[0089] As described above, the rotating member 31 has axial end portions 315a and axial end portions 316a at both ends in the X direction. Both axial end portions 315a and axial end portions 316a are provided approximately half a circumference on the Z1 side, which is the same direction side, in the circumferential direction. In other words, when viewed from the X direction, the axial end portions 315a and axial end portions 316a of the rotating member 31 of this embodiment are positioned on the Z1 side, which is the same side, relative to a straight line L orthogonal to the central axis AX.

[0090] Next, the rotating component 31A of the modified example will be described. Figure 11 This is a side view of the rotating component involved in the variation example. Figure 12 Observing from direction A Figure 11 A schematic diagram of the rotating component. Figure 13 Observing from direction B Figure 11 A schematic diagram of the rotating component.

[0091] In the modified rotating component 31A, when viewed from the X direction, the axial end portion 315Aa and the axial end portion 316a are positioned on opposite sides Z2 and Z1, respectively, relative to a straight line L orthogonal to the central axis AX. Figure 11 As shown, a first incomplete thread 315A is provided at the end closest to the X1 side of the external thread portion 311. The axial end portion 315Aa on the X1 side of the first incomplete thread 315A is... Figure 12 The shaded area is shown. The axial end face 315Aa extends radially along a first plane orthogonal to the central axis AX. Figure 12 In this configuration, the axial end portion 315Aa is located on the Z2 side in the circumferential direction of the external thread portion 311. Specifically, the axial end portion 315Aa extends from the Y1 side through the Z2 side and covers half the circumference to the Y2 side. The radial width is smallest on the Y1 side, gradually increases as it approaches the Z2 side from the Y1 side, and is largest on the Z2 side. Conversely, the width gradually decreases as it approaches the Y2 side, becoming smallest at the Y2 side. Figure 12 The separation portion 315Ab shown is located on the opposite side of the axial end portion 315Aa relative to the straight line L orthogonal to the central axis AX. That is, the separation portion 315Ab extends circumferentially from the Y1 side through the Z1 side to the Y2 side, covering half a circumference.

[0092] Here, when assuming a first plane orthogonal to the central axis AX, the shaded axial end face 315Aa abuts against the first plane. Figure 12 The separation portion 315Ab shown separates relative to the first plane toward the X2 side (the central side of the axial direction of the rotating component 31A).

[0093] like Figure 11 As shown, a second incomplete thread 316 is provided at the end closest to the X2 side of the external thread portion 311. The axial end portion 316a on the X2 side of the second incomplete thread 316 is... Figure 13 The shaded portion is shown. The axial end face 316a extends radially along a second plane orthogonal to the central axis AX. Figure 13 The axial end face 316a shown is the same as the described Figure 10 The axial end face 316a shown is the same.

[0094] As described above, the rotating member 31A has axial end portions 315Aa and axial end portions 316a at both ends in the X direction. The axial end portions 315Aa and axial end portions 316a are respectively provided on approximately half a circumference on the Z2 and Z1 sides, which are opposite directions in the circumferential direction. In other words, in the modified example of the rotating member 31A, when viewed from the X direction, the axial end portions 315Aa and axial end portions 316a are provided on the Z2 and Z1 sides, which are opposite sides, relative to a straight line L orthogonal to the central axis AX.

[0095] As described above, in the vehicle steering device 100 of this embodiment, the limiting mechanism 3 includes: a rotating member 31 having an external threaded portion 311 and a pair of cylindrical surfaces (a first cylindrical surface 312 and a second cylindrical surface 312A); a nut 32 that moves relative to the rotating member 31 in the X direction (axial direction); a pair of annular members (a first annular member 331 and a second annular member 331A) that are respectively inserted into the pair of cylindrical surfaces of the rotating member 31; and a housing 35. The annular members have flat longitudinal wall portions 332 and 332A. The external threaded portion 311 of the rotating member 31 has a first incomplete thread 315 at its end on the X1 side (one side of the axial direction) and a second incomplete thread 316 at its end on the X2 side (the other side of the axial direction). An axial end portion 315a and a separation portion 315b are provided on the X1 side surface of the first incomplete thread 315. An axial end portion 316a and a separation portion 316b are provided on the X2 side of the second incomplete thread 316.

[0096] As described above, in the limiting mechanism of Patent Document 1, the strength of the incomplete thread is less than that of the complete thread. Therefore, to prevent the annular member and the leaf spring from contacting the incomplete thread, a cylindrical part is provided at a position axially outer and on the inner circumferential side, beyond the axial end of the incomplete thread. Then, the annular member is inserted into the cylindrical part, and the leaf spring is inserted into the outer circumferential side of the annular member. Therefore, the limiting mechanism of Patent Document 1 is axially larger, making it possible to increase the size of the steering device for vehicles.

[0097] In contrast, in the limiting mechanism 3 of this embodiment, the axial end face 315a of the first incomplete thread 315 on the X1 side abuts against the end face of the longitudinal wall portion 332 of the first annular member 331 on the X2 side, and the axial end face 316a of the second incomplete thread 316 on the X2 side abuts against the end face of the longitudinal wall portion 332A of the second annular member 331A on the X1 side.

[0098] Therefore, as Figure 4 As shown, in this embodiment, firstly, when the nut 32 moves towards the X1 side due to the rotation of the rotating member 31, and the axial end face 322 of the nut 32 abuts against the longitudinal wall portion 332 of the first annular member 331, the rotating member 31 and the nut 32 are pushed towards the X2 side together. The rotating member 31 pushed towards the X2 side compresses the longitudinal wall portion 332A of the second annular member 331A on the X2 side, and its reaction force pushes the axial end face portion 316a of the second incomplete thread 316 back towards the X1 side, but the separation portion 316b does not abut against the longitudinal wall portion 332A. Furthermore, as Figure 4 As shown, when the nut 32 moves toward the X2 side by rotating the rotating member 31 and the axial end face 323 of the nut 32 abuts against the longitudinal wall portion 332A of the second annular member 331A, the rotating member 31 and the nut 32 are pushed toward the X1 side together. The rotating member 31 pushed toward the X1 side compresses the longitudinal wall portion 332 of the first annular member 331 on the X1 side. Through its reaction force, the axial end face portion 315a of the first incomplete thread tooth 315 is pushed back toward the X1 side, but the separation portion 315b does not abut against the longitudinal wall portion 332.

[0099] In summary, in this embodiment, when the nut 32 moves towards the X1 side due to the rotation of the rotating member 31, the longitudinal wall portion 332A of the second annular member 331A pushes back the axial end portion 316a of the second incomplete thread 316 towards the X1 side, but the separation portion 316b does not abut against the longitudinal wall portion 332A. Furthermore, when the nut 32 moves towards the X2 side due to the rotation of the rotating member 31, the longitudinal wall portion 332 of the first annular member 331 pushes back the axial end portion 315a of the first incomplete thread 315 towards the X2 side, but the separation portion 315b does not abut against the longitudinal wall portion 332. Thus, in the limiting mechanism 3 of this embodiment, the first annular member 331 abuts against the first incomplete thread 315 of the rotating member 31, and the second annular member 331A abuts against the second incomplete thread 316.

[0100] Therefore, compared to the limiting mechanism of Patent Document 1, where the annular component and leaf spring do not abut against the incomplete thread teeth, the limiting mechanism 3 of this embodiment can set the axial size to be smaller, thereby providing a smaller vehicle steering device 100.

[0101] Next, Figure 9 , Figure 10 The rotating component 31 of the illustrated embodiment and Figure 12 , Figure 13 By comparing with the rotating component 31A of the modified example shown, it can be explained Figure 8 , Figure 11 The different directions of the swing are shown. Figure 9 , Figure 10 In the embodiment shown, when the rotating member 31 is viewed from the X direction, the axial end portion 315a of the first incomplete thread 315 and the axial end portion 316a of the second incomplete thread 316 are arranged on the Z1 side, which is the same side, relative to the straight line L orthogonal to the central axis AX. Furthermore, Figure 8 The swing direction R1 shown is the direction centered on center O in the X direction of the central axis AX, moving clockwise (right-handed), when the rotating component 31 is viewed from the Y1 side. When the rotating component 31 is viewed from the Y1 side, the swing direction R2 is the direction centered on center O, moving counterclockwise (left-handed).

[0102] As mentioned above, such as Figure 4As shown, firstly, when the rotation of the rotating member 31 causes the nut 32 to move towards the X1 side and the axial end face 322 of the nut 32 abuts against the longitudinal wall portion 332 of the first annular member 331, the rotating member 31 and the nut 32 are pushed towards the X2 side together. The rotating member 31 pushed towards the X2 side compresses the longitudinal wall portion 332A of the second annular member 331A on the X2 side, and its reaction force pushes the axial end face portion 316a of the second incomplete thread 316 back towards the X1 side. Here, as Figure 10 As shown, the axial end portion 316a is disposed on the Z1 side relative to the separation portion 316b, therefore the rotating member 31 is in Figure 8 It swings in the direction of R1 as shown.

[0103] In addition, such as Figure 4 As shown, when the rotation of the rotating member 31 causes the nut 32 to move towards the X2 side and the axial end face 323 of the nut 32 abuts against the longitudinal wall portion 332A of the second annular member 331A, the rotating member 31 and the nut 32 are pushed towards the X1 side together. The rotating member 31 pushed towards the X1 side compresses the longitudinal wall portion 332 of the first annular member 331 on the X1 side, and its reaction force pushes the axial end face portion 315a of the first incomplete thread 315 back towards the X1 side. Here, as Figure 9 As shown, the axial end portion 315a is positioned on the Z1 side relative to the separation portion 315b, therefore the rotating member 31 is... Figure 8 It swings in the direction of R2 as shown.

[0104] As described above, when the nut 32 moves towards the X1 side and towards the X2 side, the swing direction of the rotating member 31 when viewed from the Y1 side is opposite to each other. Therefore, the first annular member 331 and the second annular member 331A are subjected to equal loads, thereby improving the durability of the first annular member 331 and the second annular member 331A.

[0105] Next, the swing direction of the rotating component 31A in the modified example will be explained. Figure 12 , Figure 13 In the rotating member 31A shown, when viewed from the X direction, the axial end face 315Aa of the first incomplete thread 315A and the axial end face 316a of the second incomplete thread 316 are positioned on opposite sides Z2 and Z1, respectively, relative to a straight line L orthogonal to the central axis AX. Furthermore, Figure 11The swing direction R1 shown is the direction centered on center O in the X direction of the central axis AX, moving clockwise (right-handed), when viewed from the Y1 side of the rotating component 31A. When viewed from the Y1 side of the rotating component 31A, the swing direction R2 is the direction centered on center O, moving counterclockwise (left-handed).

[0106] As mentioned above, such as Figure 4 As shown, firstly, when the rotation of the rotating member 31A causes the nut 32 to move towards the X1 side and the axial end face 322 of the nut 32 abuts against the longitudinal wall portion 332 of the first annular member 331, the rotating member 31A and the nut 32 are pushed towards the X2 side together. The rotating member 31A pushed towards the X2 side compresses the longitudinal wall portion 332A of the second annular member 331A on the X2 side, and its reaction force pushes the axial end face portion 316a of the second incomplete thread 316 back towards the X1 side. Here, as Figure 13 As shown, the axial end portion 316a is disposed on the Z1 side relative to the separation portion 316b, therefore the rotating member 31A is in Figure 11 It swings in the direction of R1 as shown.

[0107] In addition, such as Figure 4 As shown, when the rotation of the rotating member 31A causes the nut 32 to move towards the X2 side and the axial end face 323 of the nut 32 abuts against the longitudinal wall portion 332A of the second annular member 331A, the rotating member 31A and the nut 32 are pushed towards the X1 side together. The rotating member 31A pushed towards the X1 side compresses the longitudinal wall portion 332 of the first annular member 331 on the X1 side, and its reaction force pushes the axial end face portion 315Aa of the first incomplete thread 315A back towards the X1 side. Here, as Figure 12 As shown, the axial end portion 315Aa is positioned on the Z2 side relative to the separation portion 315Ab, therefore the rotating component 31A is... Figure 12 It swings in the direction of R1 as shown.

[0108] As described above, in the modified rotating member 31A, when the nut 32 moves to either the X1 or X2 side, the rotating member 31A swings in the direction of the swing direction R1. When the rotating member 31A swings in the direction of the swing direction R1, the case where the separating portion 315Ab is located on the Z1 side and the separating portion 316b is located on the Z2 side has the advantage of making the rotating member 31A swing more easily. This will be explained in detail below. When the nut 32 moves to the X1 side, and the rotating member 31A swings in the direction of the swing direction R1, the axial end face 316a moves slightly to the X1 side relative to the second annular member 331A, and the separating portion 316b moves slightly to the X2 side. That is, the separating portion 316b moves towards the longitudinal wall portion 332A. Here, the separating portion 316b is located closer to the X1 side than the axial end face 316a, thus creating a gap between the separating portion 316b and the longitudinal wall portion 332A. Therefore, the separating part 316b can easily approach the longitudinal wall part 332A of the second annular part 331A, and the rotating part 31A can easily swing in the direction of the swing direction R1.

[0109] Furthermore, when the nut 32 moves towards the X2 side, and the rotating member 31A swings in the swing direction R1, the axial end portion 315Aa moves slightly towards the X2 side relative to the first annular member 331, and the separating portion 315Ab moves slightly towards the X1 side. That is, the separating portion 315Ab moves towards the longitudinal wall portion 332. Here, the separating portion 315Ab is located closer to the X2 side than the axial end portion 315Aa, thus creating a gap between the separating portion 315Ab and the longitudinal wall portion 332. Therefore, the separating portion 315Ab easily approaches the longitudinal wall portion 332 of the first annular member 331, and the rotating member 31A easily swings in the swing direction R1.

[0110] [Second Implementation]

[0111] The second embodiment will be described. Figure 14 This is a cross-sectional view of the limiting mechanism section in the second embodiment. Figure 15 yes Figure 14 An enlarged cross-sectional view of the first annular component.

[0112] The limiting mechanism 3A in the second embodiment differs from the limiting mechanism 3 in the first embodiment in that the first annular component 331B is different.

[0113] like Figure 14 and Figure 15 As shown, the first annular component 331B has a longitudinal wall portion 332 and a cylindrical portion 333. Furthermore, the longitudinal wall portion 332 and the cylindrical portion 333 each have a main body portion 338 and a covering layer 339.

[0114] A cover layer 339 is disposed on the surface layer of the main body 338. The main body 338 is, for example, metal, and the cover layer 339 is, for example, resin. The elastic modulus of the main body 338 is, for example, 205 GPa. The elastic modulus of the cover layer 339 is, for example, 650 MPa. Thus, the elastic modulus of the cover layer 339 is smaller than that of the main body 338.

[0115] As explained above, in the vehicle steering device of the second embodiment, the first annular member 331B and the second annular member 331C each have a main body portion 338 and a cover layer 339 provided on the surface portion of the main body portion 338. The elastic modulus of the cover layer 339 is smaller than that of the main body portion 338. This reduces contact noise (interference noise) when the nut 32 abuts against the first annular member 331B or the second annular member 331C. Furthermore, the cover layer 339 can be made of a material that reduces the coefficient of friction with the target material to prevent snagging when the nut abuts. Alternatively, grease lubrication can be used instead of the cover layer.

[0116] [Third Implementation Method]

[0117] The third embodiment will be described. Figure 16 This is a cross-sectional view of the limiting mechanism section in the third embodiment.

[0118] The limiting mechanism 3B of the third embodiment differs from the limiting mechanism 3 of the first embodiment in that the first annular component 331D and the second annular component 331E are different.

[0119] The first annular member 331 of the first embodiment has a longitudinal wall portion 332 and a cylindrical portion 333. In contrast, the first annular member 331D of the third embodiment also has a protrusion 336. That is, the first annular member 331D has a longitudinal wall portion 332, a cylindrical portion 333, and a protrusion 336. The protrusion 336 extends circumferentially. The protrusion 336 extends from the radially outer end of the longitudinal wall portion 332 toward the X2 side.

[0120] The second annular member 331E has a longitudinal wall portion 332A, a cylindrical portion 333A, and a protrusion 337. The protrusion 337 extends circumferentially. The protrusion 337 extends from the radially outer end of the longitudinal wall portion 332A toward the X1 side.

[0121] As described above, the first annular member 331D has a protrusion 336 that protrudes toward the nut side in the X direction (axial direction) and can abut against the nut 32. The second annular member 331E has a protrusion 337 that protrudes toward the nut side in the X direction (axial direction) and can abut against the nut 32.

[0122] As explained above, in the vehicle steering device of the third embodiment, the first annular member 331D and the second annular member 331E each have a protrusion 336 or a protrusion 337 that protrudes toward the nut side in the X direction and can abut against the nut 32.

[0123] Therefore, compared to the first annular member 331 and the second annular member 331A without protrusions 336 or 337 in the first embodiment, the distance that the nut 32 can move in the X direction is smaller in the third embodiment. As a result, the limit area of ​​the steering angle of the steering wheel 22 can be reduced, and the angle that the steering wheel 10 can rotate can be set to be smaller.

[0124] [Fourth Implementation Method]

[0125] The fourth embodiment will be described. Figure 17 This is a cross-sectional view of the limiting mechanism section in the fourth embodiment.

[0126] The radial wall portion 352c of the limiting mechanism portion 3C in the fourth embodiment differs from that of the limiting mechanism portion 3 in the first embodiment. A detailed description will follow.

[0127] The housing 35A of the fourth embodiment has a cylindrical portion 352b (the main body of the housing) and a sealing portion 352g that seals the X1 side of the cylindrical portion 352b. In the housing 35A, the end on the X1 side is sealed by the sealing portion 352g.

[0128] As described above, the housing 35A of this embodiment has a cylindrical portion 352b (the main body of the housing) extending circumferentially and a sealing portion 352g that seals the X1 side of the cylindrical portion 352b.

[0129] As described above, since the housing 35A is sealed by the sealing part 352g, it is possible to prevent foreign objects such as dust from entering the inside of the housing 35A. In addition, it is possible to suppress the leakage of oil from the inside of the housing 35A to the outside.

[0130] [Fifth Implementation Method]

[0131] The fifth embodiment will be described. Figure 18 This is a cross-sectional view of the limiting mechanism section in the fifth embodiment.

[0132] In the limiting mechanism 3D of the fifth embodiment, a sealing member S is provided in the housing 35B. Hereinafter, a brief description will be given. Figure 18 As shown, the second housing 352B has a protrusion 352Bd at its end on the X1 side. A recess 354 is provided on the inner circumferential side of the protrusion 352Bd. The recess 354 extends in a circumferential shape. Furthermore, in Figure 18In the cross-section shown, the recess 354 has a generally trapezoidal shape that decreases in the X direction as it moves toward the radially outward direction. An annular sealing member S is housed inside the recess 354.

[0133] Furthermore, the first annular member 331F has a longitudinal wall portion 332 and a cylindrical portion 333F. The cylindrical portion 333F differs from the first annular member 331. Specifically, the X-direction distance of the cylindrical portion 333F of the first annular member 331F is greater than the X-direction distance of the cylindrical portion 333 of the first annular member 331. The cylindrical portion 333F seals the opening on the inner circumferential side of the recess 354. The front end S10 on the inner circumferential side of the sealing member S abuts against the cylindrical portion 333F.

[0134] As explained above, in the vehicle steering device of the fifth embodiment, the second housing 352B has a protrusion 352Bd with a recess 354, and an annular sealing member S is housed in the recess 354. The front end S10 of the inner circumferential side of the sealing member S abuts against the cylindrical portion 333F. A through hole 353 is provided in the radial wall portion 352c of the second housing 352B.

[0135] The sealing member S prevents oil leakage from the inside of the second housing 352B to the outside. Additionally, foreign matter such as dust may enter the second housing 352B through the through hole 353. However, since the front end S10 of the sealing member S abuts against the first annular member 331F, the entry of such foreign matter is prevented.

[0136] Label Explanation

[0137] 3, 3A, 3B, 3C, 3D: Limiting mechanism; 4: Steering unit; 10: Steering wheel; 11: Steering shaft; 12: Steering housing; 13: Steering reaction force device; 14: Control unit (ECU); 15: Column shaft; 16: Output shaft; 17: Torsion bar; 18: Worm gear; 18a: Spindle part; 18b: Gear tooth part; 19: Worm shaft; 19a: Shaft tooth part; 20: Steering unit; 21: Steering motor; 22: Steering wheel; 31, 31A: Rotating component; 32: Nut; 35, 35A, 35B: Housing; 100: Vehicle steering device; 110: Motor; 121: Shaft retaining component ; 122: Pin; 123: Rotary bearing component; 124: Rotary bearing component; 125, 126: Bearing; 127: Sub-housing; 128: Torque sensor; 310: External thread; 310a: Bottom; 311: External thread portion; 312: First cylindrical face portion; 312A: Second cylindrical face portion; 313: Cylindrical face; 314: Complete thread; 315, 315A: First incomplete thread; 315a, 315Aa: Axial end face portion; 315b, 315Ab: Separation portion; 316: Second incomplete thread; 316a: Axial end face portion; 316b: Separation portion; 317: Axial end face 318: Axial end face; 319: Internal spline; 321: Internal thread; 322: Axial end face; 323: Axial end face; 324: Outer peripheral surface; 325: Protrusion; 331: First annular component; 331A: Second annular component; 331B: First annular component; 331C: Second annular component; 331D: First annular component; 331E: Second annular component; 331F: First annular component; 332: Longitudinal wall portion; 332A: Longitudinal wall portion; 333: Cylindrical portion; 333A, 333F: Cylindrical portion; 334: Corner portion; 334A: Corner portion; 336: Protrusion; 337: Protrusion; 338: Main body; 339: Covering layer; 351: First housing; 351a: Joint; 351b: Longitudinal wall; 351c: Cylindrical part; 351d: Flange; 352: Second housing; 352a: Jointed part; 352b: Cylindrical part (main body of housing); 352c: Radial wall; 352g: Sealing part; 352h: Flange; 352j: Groove; 352B: Second housing; 352Bd: Protrusion; 353: Through hole; 354: Recess; BL: Bolt; H1: First bolt hole; H2: Second bolt hole; L: Straight line; R1, R2: Swinging direction; S: Sealing component; S10: Front end.

Claims

1. A vehicle steering device, wherein the steering wheel and steering wheels are mechanically not connected, wherein, The vehicle steering system includes a limiting mechanism that limits the range of the steering wheel's rotation angle when the steering wheel is rotated. The limiting mechanism includes: A rotating component has an external thread portion and a pair of cylindrical surfaces. The external thread portion has an external thread including complete and incomplete thread teeth on its outer periphery. The pair of cylindrical surfaces are adjacent to the external thread portion on one and the other sides of the central axis and have a cylindrical surface with a diameter smaller than the outer diameter of the external thread portion. The rotating component rotates in the circumferential direction about the central axis in accordance with the rotation of the steering wheel. A nut having an internal thread on its inner circumference that engages with the external thread, and moving axially relative to the rotating component as the rotating component rotates; A pair of annular components, which are respectively inserted into the pair of cylindrical faces of the rotating component and are capable of abutting against the nut in the axial direction; as well as A housing is disposed on the outer periphery of the rotating component, the nut, and the pair of annular components, and supports each of the pair of annular components between the housing and the rotating component. The external thread portion of the rotating component has a first incomplete thread on one side of its axial end and a second incomplete thread on the other side of its axial end. A complete thread is positioned between the first and second incomplete thread. The first incomplete thread has an axial end face extending along a first plane orthogonal to the central axis on one side of its axial direction, and a separation portion separating from the first plane on the other side of its axial direction. An axial end face extending along a second plane orthogonal to the central axis is provided on the other side of the second incomplete thread tooth, and a separation portion separating axially to one side relative to the second plane.

2. The vehicle steering device according to claim 1, wherein, When viewing the rotating component from the axial direction... The axial end face of the first incomplete thread and the axial end face of the second incomplete thread are configured on the same side relative to the central axis.

3. The vehicle steering device according to claim 1, wherein, When viewing the rotating component from the axial direction... The axial end face of the first incomplete thread and the axial end face of the second incomplete thread are positioned on opposite sides relative to the central axis.

4. The vehicle steering device according to any one of claims 1 to 3, wherein, At least one of the pair of annular components has a main body and a cover layer disposed on the surface of the main body, wherein the elastic modulus of the cover layer is smaller than that of the main body.

5. The vehicle steering device according to any one of claims 1 to 3, wherein, At least one of the pair of annular members has a protrusion that projects axially toward the nut side and is capable of abutting against the nut.

6. The vehicle steering device according to any one of claims 1 to 3, wherein, The housing has a cylindrical housing body extending circumferentially and a sealing portion that seals one side of the housing body axially.

7. The vehicle steering device according to any one of claims 1 to 3, wherein, The housing has: The cylindrical shell body extends circumferentially and has an opening on one side in the axial direction; The protrusion is located at one end of the main body of the housing on one side of the axial direction and protrudes towards the inner circumference and is provided with a recess that is recessed towards the outer circumference. as well as A sealing component, which is housed in the recess, The annular component is disposed on the inner circumferential side of the recess of the protrusion, and the front end of the inner circumferential side of the sealing component can abut against the outer circumferential surface of the annular component.

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